Gassmann, Andrea ; Melzer, Christian ; Seggern, Heinz von (2012)
The Li3PO4/Al electrode: An alternative, efficient cathode for organic light-emitting diodes.
In: Synthetic Metals, 161 (23-24)
doi: 10.1016/j.synthmet.2011.08.009
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In this contribution an alternative, efficient cathode for organic light-emitting diodes (OLEDs) is introduced consisting of a sub-nanometer thin lithium phosphate (Li3PO4) layer capped with aluminium. This cathode is competitive to the LiF/Al state-of-the-art cathode and performs equally well in small molecule and polymer OLEDs but yields a higher device lifetime. The functional principle of the Li3PO4/Al cathode is based on the in situ formation of a dipolar interface. Partly oriented AlPO4 dipoles are the reason for a potential drop at the interface and a work function lowering of about 500 meV. The work function of the Li3PO4/Al cathode is found to be comparable to the work function of calcium resulting in a promotion of electron injection. As the reaction products of the interface reaction are environmentally stable and chemically attached to the interface diffusion of these species into the organic layer is unlikely. This might be the reason for the observed enhanced device lifetime for devices with a Li3PO4/Al cathode.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Gassmann, Andrea ; Melzer, Christian ; Seggern, Heinz von |
| Art des Eintrags: | Bibliographie |
| Titel: | The Li3PO4/Al electrode: An alternative, efficient cathode for organic light-emitting diodes |
| Sprache: | Englisch |
| Publikationsjahr: | Januar 2012 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Synthetic Metals |
| Jahrgang/Volume einer Zeitschrift: | 161 |
| (Heft-)Nummer: | 23-24 |
| DOI: | 10.1016/j.synthmet.2011.08.009 |
| Kurzbeschreibung (Abstract): | In this contribution an alternative, efficient cathode for organic light-emitting diodes (OLEDs) is introduced consisting of a sub-nanometer thin lithium phosphate (Li3PO4) layer capped with aluminium. This cathode is competitive to the LiF/Al state-of-the-art cathode and performs equally well in small molecule and polymer OLEDs but yields a higher device lifetime. The functional principle of the Li3PO4/Al cathode is based on the in situ formation of a dipolar interface. Partly oriented AlPO4 dipoles are the reason for a potential drop at the interface and a work function lowering of about 500 meV. The work function of the Li3PO4/Al cathode is found to be comparable to the work function of calcium resulting in a promotion of electron injection. As the reaction products of the interface reaction are environmentally stable and chemically attached to the interface diffusion of these species into the organic layer is unlikely. This might be the reason for the observed enhanced device lifetime for devices with a Li3PO4/Al cathode. |
| Freie Schlagworte: | OLED, Electron injection, Li3PO4/Al, Interface reaction, Dipolar layer |
| Zusätzliche Informationen: | Conference Proceedings of Symposium N, E-MRS 2011 Spring Meeting, Nice, France |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Elektronische Materialeigenschaften |
| Hinterlegungsdatum: | 15 Nov 2013 09:12 |
| Letzte Änderung: | 13 Aug 2021 14:08 |
| PPN: | |
| Sponsoren: | This work was supported in the framework of the OPAL 2008 project (BMBF 13N8995). , The authors thank the German Federal Ministry of Education and Research for the financial support. |
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